L2TP, or Layer 2 Tunneling Protocol, is a networking protocol used to support virtual private networks (VPNs). It allows the secure transmission of data over the internet by creating a tunnel between two points, ensuring that the data remains private and protected from unauthorized access. L2TP does not provide encryption by itself, so it is often paired with other protocols like IPsec to enhance security. This protocol is widely used for remote access and site-to-site connections, making it a popular choice for businesses and individuals seeking secure communication. By encapsulating data packets, L2TP helps maintain the integrity and confidentiality of information as it travels across public networks.